Worked on stabilizing the CLI manifest workflow in the tuist/tuist repository, focusing on improving reliability rather than adding new features. Addressed a concurrency issue by fixing a race condition in the CachedManifestLoader, enabling safe parallel writes and enhancing manifest loading stability under concurrent operations. Applied asynchronous programming techniques and file system management skills using Swift to ensure the CLI could handle multiple operations without data corruption or flakiness. Collaborated closely with peers to deliver a well-documented, targeted fix that supports ongoing code maintainability. The work prioritized robust engineering practices and improved the resilience of the CLI in collaborative environments.